Heat pack insert



FIG. 1 is a front elevation view of the design of the present invention;

FIG. 2 is a front perspective view of the design of the present invention showing an external holder housing the insert;

FIG. 3 is a top plan view of the design of the present invention; and,

FIG. 4 is a side elevation view of the design of the present invention.

The broken line showing of the external holder in FIG. 1 is included for the purpose of illustrating use and environment and forms no part of the claimed design. 

CLAIM The ornamental design for a heat pack insert, as shown and described. 